let s="𠮷";
console.log(s.length);//2
console.log(s.charCodeAt(0));//55362
console.log(s.charCodeAt(1));//57271
console.log(s.codePointAt(0));//134071
console.log(s.codePointAt(1));//57271

const format="YYYY-MM-DD";
let str="123-23-03";
console.log(str.padStart(10,format));
month="19";
console.log(month.padStart(2,0));
